We study the process $qq\ensuremath{\rightarrow}qqg$ at lowest order in QCD perturbation theory to understand gluon radiation in the fragmentation region of relativistic heavy ion collisions. We arrive at a formula for gluon multiplicity that interpolates between $\ensuremath{\sim}1/{k}_{\ensuremath{\perp}}^{2}$ behavior at low ${k}_{\ensuremath{\perp}}$, to $\ensuremath{\sim}1/{k}_{\ensuremath{\perp}}^{4}$ at large ${k}_{\ensuremath{\perp}}$.

中文翻译：

---

相对论重离子碰撞中的胶子韧致辐射

我们研究了 QCD 微扰理论中最低阶的过程 $qq\ensuremath{\rightarrow}qqg$，以了解相对论重离子碰撞碎裂区域中的胶子辐射。我们得出了一个胶子多重性公式，该公式在 $\ensuremath{\sim}1/{k}_{\ensuremath{\perp}}^{2}$ 低 ${k}_{\ensuremath{\ perp}}$，到 $\ensuremath{\sim}1/{k}_{\ensuremath{\perp}}^{4}$ 大 ${k}_{\ensuremath{\perp}}$。